netdev - Re: [PATCHv4 2/5] net: phy: extend fixed driver with fixed_phy

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Date:	Thu, 3 Sep 2015 22:20:35 +0300
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
	devicetree@...r.kernel.org
Cc:	Florian Fainelli <florian@...nwrt.org>,
	Tawfik Bayouk <tawfik@...vell.com>,
	Nadav Haklai <nadavh@...vell.com>,
	Lior Amsalem <alior@...vell.com>,
	Gregory Clement <gregory.clement@...e-electrons.com>,
	Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>,
	linux-arm-kernel@...ts.infradead.org,
	Grant Likely <grant.likely@...retlab.ca>,
	Rob Herring <robh+dt@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Christian Gmeiner <christian.gmeiner@...il.com>
Subject: Re: [PATCHv4 2/5] net: phy: extend fixed driver with
 fixed_phy_register()

Hello.

On 05/16/2014 06:14 PM, Thomas Petazzoni wrote:

> The existing fixed_phy_add() function has several drawbacks that
> prevents it from being used as is for OF-based declaration of fixed
> PHYs:
>
>   * The address of the PHY on the fake bus needs to be passed, while a
>     dynamic allocation is desired.
>
>   * Since the phy_device instantiation is post-poned until the next
>     mdiobus scan, there is no way to associate the fixed PHY with its
>     OF node, which later prevents of_phy_connect() from finding this
>     fixed PHY from a given OF node.
>
> To solve this, this commit introduces fixed_phy_register(), which will
> allocate an available PHY address, add the PHY using fixed_phy_add()
> and instantiate the phy_device structure associated with the provided
> OF node.
>
> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>
> Acked-by: Florian Fainelli <f.fainelli@...il.com>
> Acked-by: Grant Likely <grant.likely@...aro.org>
> ---
>   drivers/net/phy/fixed.c   | 61 +++++++++++++++++++++++++++++++++++++++++++++++
>   include/linux/phy_fixed.h | 11 +++++++++
>   2 files changed, 72 insertions(+)
>
> diff --git a/drivers/net/phy/fixed.c b/drivers/net/phy/fixed.c
> index e41546d..d60d875 100644
> --- a/drivers/net/phy/fixed.c
> +++ b/drivers/net/phy/fixed.c
[...]
> @@ -203,6 +204,66 @@ err_regs:
[...]
> +int fixed_phy_register(unsigned int irq,
> +		       struct fixed_phy_status *status,
> +		       struct device_node *np)
> +{
> +	struct fixed_mdio_bus *fmb = &platform_fmb;
> +	struct phy_device *phy;
> +	int phy_addr;
> +	int ret;
> +
> +	/* Get the next available PHY address, up to PHY_MAX_ADDR */
> +	spin_lock(&phy_fixed_addr_lock);
> +	if (phy_fixed_addr == PHY_MAX_ADDR) {
> +		spin_unlock(&phy_fixed_addr_lock);
> +		return -ENOSPC;
> +	}
> +	phy_addr = phy_fixed_addr++;
> +	spin_unlock(&phy_fixed_addr_lock);
> +
> +	ret = fixed_phy_add(PHY_POLL, phy_addr, status);

    Was rummaging in the fixed_phy driver and a bug sprang right at me: 'phy' 
should have been passed here, not PHY_POLL. Luckily, all callers pass PHY_POLL 
anyway...

[...]

MBR, Sergei

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